Commitments, Guarantees, Product Warranties and Other Loss Contingencies (WMC Roll Forward) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Financial Information For Discontinued Operations [Line Items]
Pending claims, beginning of period	$ 6,516
WMC
Financial Information For Discontinued Operations [Line Items]
Reserve, beginning of period	626	$ 875
Provision	0	57
Claim resolutions	0	(99)
Reserve, end of period	$ 626	$ 833

Pending Repurchase Claims Based Upon Representations And Warranties

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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Amount of increase (decrease) in loss contingency liability.

+ References

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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

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